centos 6.0 32bit系统安装控制机时，postgresql启动失败，查看postgre数据库的日志（pgstartup.log），报错如下：

FATAL:  could not create shared memory segment: Invalid argument
DETAIL:  Failed system call was shmget(key=5432001, size=71213056, 03600).
HINT:  This error usually means that PostgreSQL's request for a shared memory segment exceeded your kernel's SHMMAX parameter.  You can either reduce the request size or reconfigure the kernel with larger SHMMAX.  To reduce the request size (currently 71213056 bytes), reduce PostgreSQL's shared_buffers parameter (currently 8000) and/or its max_connections parameter (currently 203).

If the request size is already small, it's possible that it is less than your kernel's SHMMIN parameter, in which case raising the request size or reconfiguring SHMMIN is called for.

The PostgreSQL documentation contains more information about shared memory configuration.